jonathan pease, president 5104 mann drive, ringwood, …€¦ · · 2016-04-19jonathan pease,...

Jonathan Pease, President 5104 Mann Drive, Ringwood, IL 60072 (815)653-2585 www.RockSolidStabilization.com

2016 NORTH DAKOTA ASPHALT CONFERENCE

Who is ARRA?

Incorporated in September 1976, ARRA’s primary function has been to promote the recycling of existing roadway materials through various construction methodologies, to preserve limited natural resources and reduce costs. This ongoing effort continues through education, strategic alliances and partnering at both the industry and agency level. (Mission Statement)

• Not for Profit Organization made up of DOT agencies, equipment suppliers, Material suppliers, contractors & etc.

• Closer Partnerships with the FHWA and others to build awareness of the overall industry


Industry Overview

Choose the right process, @ the right time,

on the right road, for the right price

• Visual site investigation• Subsurface investigation (includes subgrade)• Classify & Quantify each layer to determine existing condition/performance• Mix Design and/or recommendations from experienced person for all present varying

conditions, choose the “right team”• Cost comparison of available options• Fix subgrade drainage issues if needed • Utilizing a competent “team” of civil engineer, geotechnical engineer and contractor• Realize and inform customer that there can be field changes due to unforeseen circumstances

at times• Infield QC/QA when possible


Industry overview

pavement preservation processes

Crack Treatments Chip Seal Slurry Pavement

Micro Surfacing Combination of (ex. Cape Seal)


Industry Overview

recycling processes

Milling HIR - Hot In-Place Recycling CIR - Cold In-Place Recycling

FDR - Full Depth Reclamation Soil Stabilization/ Modification Mix Design/ Testing


Pavement Condition Index


Crack Treatments

Crack treatments consist of placing specialized materials into prepared cracks to prevent water and incompressible intrusion into the cracks and underlying pavement layers, and to reinforce the adjacent pavement. Restriction of water entry into underlying pavement base and sub-grade layers serves to maintain pavement strength and prolong pavement life. Pavements in different climate zones, with different construction types, and with different traffic loadings experience different types of cracking. The various crack types experience different movement ranges depending mostly on crack spacing and temperature variations. Different types of crack treatment materials and installation geometries are required for the different conditions. (ISSA)


Chip Seal

Chip Seal is an application of a bituminous binder covered with an application of clean graded aggregate to an existing asphalt surface. It is also known as armor coat, bituminous sealing or seal coat, to name a few. The binders may be emulsions, paving grade asphalt cements, and modified versions of each being modified with various polymers such as latex, tire and natural rubbers.The aggregates commonly vary in size from a maximum of 5/8 of an inch to a minimum of ¼ inch with less than 5% passing the No. 4 screen. Aggregate must be durable with the use of crushed stone, gravels or manufactured aggregates. Aggregates may be precoated with a small % of asphalt cement when used with hot asphalt binders. Chip Seal has been used in various forms since at least the early 1900’s. The quality has improved over the years with better binder technology, cleaner aggregates, and improved equipment and a better understanding of how the materials perform together. (ISSA)


Slurry Pavement

Slurry Pavement is the principal materials used to create slurry seal such as aggregate, asphalt emulsion, and filler, which are mixed together according to a laboratory’s design-mix formula. Water is also added for workability.Asphalt emulsions serve as a binder, holding the crushed aggregate together and adhering the new slurry surfacing to the old surface over which it is being applied. Various emulsions and aggregates are used to meet the conditions, specifications, and requirements of individual projects.The aggregate must be clean, crushed, durable, properly graded, and uniform. The asphalt emulsion is a three-part system consisting of asphalt, water, and emulsifier. Fillers such as Portland cement, hydrated lime, or aluminum sulfate liquid are often used in small quantities as stabilizers or chemical modifiers. (ISSA)


Micro-Surfacing

Micro Surfacing, one of the most versatile tools in the road maintenance arsenal, is a polymer-modified cold-mix paving system that can remedy a broad range of problems on today’s streets, highways, and airfields.Like its parent product, slurry seal, Micro Surfacing begins as a mixture of dense-graded aggregate, asphalt emulsion, water, and mineral fillers. While conventional slurry seal is used around the world as an economical treatment for sealing and extending the service life of both urban and rural roads, Micro Surfacing has added capabilities, thanks to the use of high-quality, carefully monitored materials, including advanced polymers and other modern additives. (ISSA)


Any combination of the previous treatments

(Cape Seal)

Cape Seal is a layer of bituminous surface treatment or chip seal, followed by an application of the micro surfacing. This process combines the benefits of chip sealing and micro surfacing and offers a finish that is similar to an asphalt overlay, but at a lower cost. (ISSA)


Milling

Definition

Milling is the removal of a existing

asphalt concrete prior to placing a

surface treatment or full depth

removal. There are many different

reasons for milling and types of milling

like Micro or profiling or full depth

removal of asphalt.


HIRHot In-Place Recycling

DefinitionHot In-place Recycling is an on-site, in-place, pavement rehabilitation method that consists of heating, scarifying, softening, mixing, placing and re-compacting the existing bituminous pavement.


HIR

Hot In-Place Recycling

Methods

• Two Types of HIR Methods• Surface Method

• Hot-In-Place Recycling Surface Method is an on-site, in place, pavement rehabilitation method that consists of heating, scarifying, mixing, replacing and re-compacting the existing bituminous pavement.

• Re-HEAT Method• Re-HEAT is an on-site, in place,

pavement rehabilitation method that consists of heating the existing pavement, removing the top surface course, adding an asphalt rejuvenating emulsion, mixing the material uniformly in an on-board mixing drum, re-layingthe recycled material, followed by compacting.


HIR


the process (surface method)

1st Preheat

(180 – 200 Degrees)


HIR



2nd Preheat

(280-300 Degrees)

Preheat


HIR



Rejuvenating Agent

Preheat

2nd Preheat


HIR



Loosen Pavement

Preheat

Rejuvenating

Agent

2nd Preheat


HIR



Remix

Preheat

Rejuvenating

Agent

2nd Preheat

Loosen pavement


HIRHot In-Place Recycling


Re-profile

Preheat

Rejuvenating

Agent

2nd Preheat

Loosen pavement

Remix


HIR



Finish Roll

Preheat

Rejuvenating

Agent

2nd Preheat

Loosen pavement

Re-profile

Remix


HIR



Final Surface Course

Preheat

Rejuvenating

Agent

2nd Preheat

Loosen pavement

Re-profile

Remix

Finish Roll


CIR

cold In-Place Recycling

definition

Cold In-place Recycling is a method of reconstructing the top layer of pavement where the need arises from structural failures. These failures include: transverse cracking, wheel rutting, potholes, surface irregularities, or a combination of the above. (ARRA)


CIR


cross section

Existing W/ CIR


CIR


candidates

• Deteriorating Asphalt (Maintenance) • Secondary Roads• City Streets• Interstate Highways• Airport Runways• Large parking lots


CIR


how to utilize CIR

• Thermal Cracking• Poor Rideability• Fatigue Cracking• Patched/ Dry and

Raveling Roads


CIRcold In-Place Recycling

additives

• Emulsions• Foamed Asphalt• Other additives can be

incorporated into either Emulsions or Foamed Asphalt


CIR


single unit

• Small size for urban projects• Short turning radius• Less operating/ mobilization costs


CIRcold In-Place Recycling

the process (single train)


CIR


multi unit

• Rural/ long stretches of roads

• Sizing control• Mix in pugmill not a drum



the process (multi-train)


FDRFull depth reclamation

definition

Full Depth Reclamation is a technique in which the full flexible pavement section and a

predetermined portion of the underlying materials are uniformly crushed, pulverized, or

blended, resulting in a stabilized base course; further stabilization may be obtained through

the use of available additives. By addressing the entire pavement section, full depth

reclamation is able to correct delinquent cross sections, increase the load-bearing strength of the base, and utilize 100% of the existing

materials. (ARRA)



cross section

Full Depth ReclamationExisting


Full depth reclamation

Cold Recycling Mill vs. reclaimer

• Collects millings into central windrow• Utilize to remove surface asphalt if your project is

sensitive to grade/ elevation

• Keeps pulverized material in same path• Creates homogenous blend

• Adds volume/ raises grade• > 6” compact before grading



Candidates

• Deteriorated Asphalt and/or Aggregate Base (Reconstruction)• Parking Lots• Industrial Storage Lots• All Roads

• City Streets• Interstate Highways• Secondary Roads

• Airport Runways



when to utilize fdr

• Frequent Deep Cracking• Reflective Cracking• Heavy Pothole Patching

• Spec’d or Value Engineered on Asphalt Pavements in Need of Replacement

• Severe Rutting/ Shoveling• Frost Heaves (may require drainage corrections)

• Insufficient Base Strength



mechanical stabilization

• Recompaction of pulverized asphalt and/or aggregate surface• May incorporate the addition of supplemental aggregate• No stabilizer or binder are incorporated into the blend



chemical stabilization

• Includes the addition of chemical stabilizers such as:• Portland Cement

• Dry or Slurry • Quicklime or Hydrated Lime

• Dry or Slurry • Lime Kiln Dust (LKD)• Cement Kiln Dust (CKD)• Class “C” Fly ash

• Or blends of the above



bituminous stabilization

• Includes the addition of bituminous binders• Emulsified Asphalt• Expanded Foam



The Process

Pre-pulverization



The Process

Shape & CompactPre-pulverization


TransportationPre-pulverization

Shape & Compact


The Process


Spreading

Transportation

Pre-pulverization

Shape & Compact


The Process


Mixing Powder

Spreading

Transportation

Pre-pulverization

Shape & Compact


The Process


Mixing

Emulsion/Foam

Spreading

Mixing

Transportation

Pre-pulverization

Shape & Compact


The Process


Compacting

Spreading

Mixing

Transportation

Pre-pulverization

Shape & Compact


The Process


Grading

Spreading

Mixing

Compacting

Transportation

Pre-pulverization

Shape & Compact


The Process


Spreading

Mixing

Compacting

GradingTransportation

Pre-pulverization

Shape & Compact

Finish Static Roll


The Process


Soil stabilization/ modification

definition

Soil Stabilization is the long-term physical and chemical alteration of soils to enhance their physical and engineering properties. Stabilization of in-place soils by incorporating available

additives can increase the shear strength of a soil and/or control the shrink-swell properties of a soil, thus improving the load bearing capacity of a subgrade to support pavements and

foundations. (ARRA)

Soil Modification, sometimes referred to as “mud drying”. Soil Modification is primarily intended to reduce moisture content and the plasticity in order to expedite construction, whereas stabilization can substantially increase the shear strength of a material such that it can be

incorporated into the projects structural design. (ARRA)



cross section

Unstable Wet Subgrade Stabilized Subgrade



candidates

• Soil Modification • Up to 20’+• Dry wet/ unstable soil that cannot be

properly compacted due to high moisture • High groundwater• Previous rain events• Unstable soil

• Reduce moisture/ strengthen subgrade

• Soil Stabilization• Spec’d to add strength to the top 8” – 14”

of subgrade• Spec’d to reduce moisture and stabilize soil

characteristics of swelling and/or shrinkage



when to utilize soil stab/mod

• Spec’d• To improve structural integrity of the entire

pavement section• To reduce thickness of aggregate base or

asphalt to achieve overall structural strength determined by the engineer• 1” stabilized subgrade = 1” compacted

aggregate base (.10 - .14 structural coefficient)

• Reactive• To avoid project delays• To reduce costs of undercuts• To utilize onsite materials• To improve subgrade prior to aggregate

placement (pass a proof roll)



typical stabilizers/ binders

• Lime (%)• Lime Kiln Dust (LKD) (3-

6%)• Quicklime (1-3%)

• Flyash(%)• Class C (8-12%) • Class F, not on its own

• Portland Cement (3-6%)• Type I/II

• Slurry• Mostly urban areas• More expensive than

powders• Less dusty

• Others• Enzymes, polymers, other

stabilizers



the process

Transportation



the process

SpreadingTransportation



the process

Mixing & WaterTransportation

Spreading



the process

CompactionTransportation

Mixing & Water

Spreading



the process

GradingTransportation

Mixing & Water

Spreading

Compaction



the process

Finish Static RollTransportation

Mixing & Water

Spreading

Grading

Compaction


Mix Design/ Testing

jonathan pease, president 5104 mann drive, ringwood, …€¦ · · 2016-04-19jonathan pease,...

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